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Windows programming is event driven, which means that while a program is running, it can be interrupted at any time by user actions or system actions such as button clicks, key presses, or system timers. When this happens, the program needs to handle the event and then continue on its course. If you want your program to perform some set of tasks when a particular event occurs, you must write a method, called an event handler, to be called when the event occurs. The mechanism the system uses for this process is called an event. An event is a .NET object that contains a list of references to the methods, the event handlers, associated with it. The system takes care of sensing when an event occurs. When the event occurs, all the event handlers associated with the event are invoked, sequentially. You can specify in your XAML that an object should handle a particular event and give the name of the event handler for it. Since event handlers are methods, they must be written in imperative code, such as C# not in XAML. The Button class has more than 90 events associated with it. The following markup specifies that event handlers in the program will handle three of those events Click, MouseEnter, and MouseLeave. The names of the event handler methods are assigned to each event. <StackPanel> <Button Name="myButton" Padding="10" Click ="myButton_Click" MouseEnter="myButton_MouseEnter" MouseLeave="myButton_MouseLeave">Click Me</Button> </StackPanel> Figure 9-1 illustrates the button s events and the event handlers attached to them. The up arrows following the event names in the figure indicate that the member is an event.

Click the Calculator icon to start the Calculator app. In portrait mode (vertical) view, the Calculator application is a basic calculator. All functions are activated by simply touching the corresponding key to perform the desired action. Need to store something in memory Use the following keys to do so:

This program takes a particular action for each of these events. Figure 9-2 shows what the window looks like on each of these actions. When the mouse pointer enters the button area, the MouseEnter event is raised, which calls the myButton_MouseEnter event handler. This method changes the button text to Mouse Over . When the mouse pointer leaves the button area, the MouseLeave event is raised, which calls the myButton_MouseLeave event handler. This method changes the button text back to Click Me . When the button is clicked, the Click event is raised, which calls the myButton_Click event handler. This method sets the button text to either Clicked or Clicked Again .

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M+ to add it into memory M- to subtract the number from memory MC to clear memory MR to recall the number in memory to the screen

Figure 9-2. The button changes its text whenever one of the three events is raised. The event handler code, shown here, simply changes the text of the button: private void myButton_MouseEnter( object sender, MouseEventArgs e ) { myButton.Content = "Mouse Over"; } private void myButton_MouseLeave( object sender, MouseEventArgs e ) { myButton.Content = "Click Me"; } private void myButton_Click( object sender, RoutedEventArgs e ) { string c = myButton.Content.ToString(); myButton.Content = (c == "Clicked" || c == "Clicked Again") "Clicked Again" : "Clicked"; }

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Viewing the Scientific Calculator (Landscape Mode)

The signature and return type for event handlers is fairly boilerplate but not quite. The following code shows an example that uses a handler for an event generated by a mouse. Standard event handlers have the following characteristics: The return type must be void. The first parameter is a reference to the object that triggered the event. This is an object of type object and is usually named sender. Since the type of the parameter is object, you need to cast it back to the appropriate type if you want to access the object s members. The second parameter is an object that can contain additional information passed by the event. The type of this parameter is either EventArgs or a subclass of EventArgs.

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